基于LSA FMECA的民机燃油系统故障模式研究

发布时间：2018-03-04 01:17

本文选题：燃油系统　切入点：LSA　出处：《中国民航大学》2015年硕士论文　论文类型：学位论文

【摘要】：燃油系统作为民用飞机的关键系统之一,不仅担负着给发动机和APU输送燃料的任务,还具有调整飞机重心和冷却其他设备的作用,其一旦出现故障,将会危及飞行安全,所以对燃油系统进行可靠性与保障性研究是飞机系统风险分析的关键环节。基于后勤保障分析,本文对民用飞机燃油系统的故障模式进行研究,首先建立了适用于民机系统的LSA FMEA分析流程,并对分析流程进行详细介绍。然后,在对故障模式危害性分析RPN法和模糊综合评判法进行研究的基础上,针对故障模式危害性评价指标的离散性和不完整性、定量和定性指标的不平衡性等问题,提出基于数据包络分析评价LSA故障模式危害性的C2R模型。在模型中利用相对比较法对故障模式危害性各个评价指标进行权重约束,改进了传统方法不能均衡各种风险要素的不合理性,同时对模型算法进行研究,采用基于单纯形法的模型求解方法求解。最后,以某型民机燃油系统为例,对燃油系统各子系统进行研究,建立其可靠性框图和功能框图,利用所研究的理论方法对其进行LSA故障模式影响及危害性分析,并与基于模糊综合评判法的危害性分析结果进行对比,通过对故障模式进行风险排序,输出了燃油系统的关键故障模式清单。同时,以LSA FMECA技术为基础,结合燃油箱系统的故障模式影响及危害性分析过程,开发了用于民机系统故障模式分析的软件系统。
[Abstract]:As one of the key systems of civil aircraft, fuel system not only takes on the task of delivering fuel to engine and APU, but also has the function of adjusting the center of gravity of aircraft and cooling other equipment. Once it breaks down, it will endanger flight safety. Therefore, the reliability and supportability of fuel system is the key link of aircraft system risk analysis. Based on logistic support analysis, this paper studies the failure mode of civil aircraft fuel system. Firstly, the LSA FMEA analysis flow for civil aircraft system is established, and the analysis flow is introduced in detail. Then, on the basis of the research on RPN method and fuzzy comprehensive evaluation method of fault mode hazard analysis, Aiming at the discreteness and incompleteness of hazard evaluation index of fault mode, the imbalance of quantitative and qualitative indexes, etc. A C2R model based on data envelopment analysis is proposed to evaluate the hazard of LSA fault mode. In the model, the relative comparison method is used to constrain the weight of each evaluation index. The traditional method can not balance the irrationality of various risk factors. At the same time, the model algorithm is studied, and the model solving method based on simplex method is adopted. Finally, a civil aircraft fuel system is taken as an example. The reliability block diagram and function block diagram of each subsystem of fuel system are studied, and the influence and harm of LSA fault mode are analyzed by using the theory and method studied in this paper. Compared with the results of hazard analysis based on fuzzy comprehensive evaluation, the list of key fault modes of fuel system is output by ranking the risk of fault modes. At the same time, on the basis of LSA FMECA technology, A software system for fault mode analysis of civil aircraft system is developed based on the fault mode influence and hazard analysis process of fuel tank system.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V267

【参考文献】